How can I install the extension locally?

Currently, the extension is installed globally into /usr/share/nautilus-python/extensions
This does not support backup of the extension.

I would like to install the extension to $HOME/.local/share/nautilus-python/extensions
Icons would be installed to $HOME/.local/share/.icons

I'm not very familiar with Python or install scripts, but looking briefly at folder-colors.py and README it looks like this may be quite an easy fix via setup.py's --previx switch?
Looks like most of the script can easily support this with os.getenv('HOME').